Updates dashboard UI and improves styling

Improves the dashboard's appearance and user experience by updating styles and layouts.

Changes include:
- Updates to color schemes and spacing for better readability and visual appeal.
- Implements a responsive layout for the header to adapt to different screen sizes.
- Refactors button styles for consistency and clarity.
- Adds a gradient background to the main dashboard page.
- Updates the NextAuth URL in the development environment.

next.config.js

@@ -2,7 +2,7 @@
 const nextConfig = {
   reactStrictMode: true,
   // Allow cross-origin requests from specific origins in development
-  allowedDevOrigins: ["192.168.1.2"],
+  allowedDevOrigins: ["192.168.1.2","localhost","propc"],
 };
 
 export default nextConfig;